COMMITMENTS AND CONTINGENCIES - Environmental Contingencies, Other Purchase Obligations and Other Matters (Details) $ in Millions	3 Months Ended
Sep. 30, 2018 USD ($) aircraft Facility
Other Commitments [Line Items]
Number of former waste disposal facilities \| Facility	3
Number of aircraft suspend operations \| aircraft	21
Low
Other Commitments [Line Items]
Estimate of possible loss	$ 5.0
High
Other Commitments [Line Items]
Estimate of possible loss	6.0
Other Commitments
Other Commitments [Line Items]
Purchase obligations	$ 37.7

The number of aircraft that suspended operations as a result of an incident.

No definition available.

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- Definition

Number of locations were the company is named as a potential responsible party.

+ References

No definition available.

+ Details

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 440
-SubTopic 10
-Section 50
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